#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main()
{
    int a = 0;
    int b = 0;
    int c = 0;
    while (scanf("%d %d %d", &a, &b, &c))
    {
        if (((a + b) > c) && ((a + c) > b) && ((b + c) > a))
        {

            if ((a == b) && (a == c))
            {
                printf("Equilateral triangle!");
            }
            else if (((a == b) && (a != c)) || ((a == c) && (a != b))
                                            || ((b == c) && (b != a)))
            {
                printf("Isosceles triangle!");
            }
            else
            {
                printf("Ordinary triangle!");
            }
        }
        else
        {
            printf("Not a triangle!");
        }
        printf("\n");
    }

    return 0;
}